1 /* |
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2 * Copyright (c) 2001, 2005, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 #include "jni.h" |
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27 #include "jni_util.h" |
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28 #include "jvm.h" |
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29 #include "jlong.h" |
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30 #include "sun_nio_ch_PollArrayWrapper.h" |
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31 #include <poll.h> |
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32 #include <unistd.h> |
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33 #include <sys/time.h> |
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34 |
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35 #define RESTARTABLE(_cmd, _result) do { \ |
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36 do { \ |
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37 _result = _cmd; \ |
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38 } while((_result == -1) && (errno == EINTR)); \ |
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39 } while(0) |
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40 |
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41 static int |
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42 ipoll(struct pollfd fds[], unsigned int nfds, int timeout) |
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43 { |
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44 jlong start, now; |
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45 int remaining = timeout; |
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46 struct timeval t; |
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47 int diff; |
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48 |
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49 gettimeofday(&t, NULL); |
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50 start = t.tv_sec * 1000 + t.tv_usec / 1000; |
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51 |
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52 for (;;) { |
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53 int res = poll(fds, nfds, remaining); |
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54 if (res < 0 && errno == EINTR) { |
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55 if (remaining >= 0) { |
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56 gettimeofday(&t, NULL); |
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57 now = t.tv_sec * 1000 + t.tv_usec / 1000; |
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58 diff = now - start; |
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59 remaining -= diff; |
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60 if (diff < 0 || remaining <= 0) { |
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61 return 0; |
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62 } |
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63 start = now; |
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64 } |
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65 } else { |
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66 return res; |
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67 } |
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68 } |
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69 } |
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70 |
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71 JNIEXPORT jint JNICALL |
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72 Java_sun_nio_ch_PollArrayWrapper_poll0(JNIEnv *env, jobject this, |
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73 jlong address, jint numfds, |
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74 jlong timeout) |
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75 { |
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76 struct pollfd *a; |
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77 int err = 0; |
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78 |
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79 a = (struct pollfd *) jlong_to_ptr(address); |
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80 |
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81 if (timeout <= 0) { /* Indefinite or no wait */ |
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82 RESTARTABLE (poll(a, numfds, timeout), err); |
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83 } else { /* Bounded wait; bounded restarts */ |
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84 err = ipoll(a, numfds, timeout); |
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85 } |
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86 |
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87 if (err < 0) { |
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88 JNU_ThrowIOExceptionWithLastError(env, "Poll failed"); |
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89 } |
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90 return (jint)err; |
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91 } |
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92 |
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93 JNIEXPORT void JNICALL |
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94 Java_sun_nio_ch_PollArrayWrapper_interrupt(JNIEnv *env, jobject this, jint fd) |
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95 { |
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96 int fakebuf[1]; |
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97 fakebuf[0] = 1; |
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98 if (write(fd, fakebuf, 1) < 0) { |
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99 JNU_ThrowIOExceptionWithLastError(env, |
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100 "Write to interrupt fd failed"); |
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101 } |
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102 } |
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